Grinding-wheel clamp.



J. J. GRAIN.

GRINDING WHEEL CLAMP.

APPLICATION FILED MAYIG, 1918.

1,300, 161 Patented Apr. 8,1919.

2 SHEETS-SHEET I.

WWW/w Wot/nap 1.]. GRAIN.

GRINDING WHEEL CLAMP. APPLICATION FILED MAYIG, I918.

1,300,]. 61 Patented Apr-.8, 1919.

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2 suznsqnser 2- JACOB J. GRAIN, 0F GRAND RAPIDS, WISCONSIN.

GRINDING-WHEEL CLAMP.

Specification 2f I ctters Patent. Patented Apr. 8, 1919.

Applica ion filed May 16, 1918. Serial No. 234,988.

1'0 all whom it may concern:

Be it known that I, JACOB J. GRAIN, a citizen of the United States,residing at Grand Rapids, in the county of Wood and State of Wisconsin,have invented certain thereon, but the conditions under which the stoneoperates are such as to cause rusting and pitting of the screw threadsso that they are not only short-lived, but greatly interfere withremoval of the disks whenever it is necessary to apply a new grindingstone, usually about once in eighteen months. In screwing the old disksin place, it has been necessary to connect. say a 16 foot rail theretoin some suitable manner for use as a lever, several men then pullingdownwardly on the outer end of the rail, this operation being alsonecessarily duplicated in removing the disks. In threading the disks inplace, they cannot be as tightly engaged with the wheel as desirable, bythe method above set forth, yet considerable difficulty is experiencedin removing the disks after the life of the stone is exhausted. In fact,it often happens that the entire stone and arbor must be shipped to afoundry in order to remove the old disks. Even then, it is'often foundthat the screw threads are so rusted and pitted as to be of no furtheruse.

My invention aims to overcome the difliculties above pointed out byproviding a stone clamp which operates totally without the use of screwthreads, the arrangement being such as to not only permit easyremoval.of a worm stone, but to cause the rotation of the shaft and theresistance offered by the stone to cooperate in more tightly clampingthe latter in place.

With the foregoing object in view, the invention resides in the novelarrangement and construction of parts herein described and claimed, andshown in the accompanying drawings wherein:

Figure 1 is a side elevation of the improved clamping means applied to astone;

Fig. 2 is a longitudinal section of the parts shown in Fig. 1;

Fig. 3 is a transverse section on the plane of the line 33 of Fig. 1;and

Fig. 4 is a similar View on the the line fof Fig. 1.

In the drawings above briefly described, the numeral 1 designates thegrinding stone of a pulp mill although it is to be understood that myinvention could be used for securing other forms of grinding Wheels inplace. The center of the stone 1 is formed with the usual bore 2 throughwhich the arbor or shaft 3 passes, and cement may be used if required toprovide for snug replane of ception of said shaft or arbor in the bore.

An abutment disk 4 is provided with a hub 5 at its center, said hubbeing keyed at 6 on the arbor 3 and resting against a shoulder 7thereon. The inner end of the hub 5 by preference extends. beyond theinner face of the disk 4, and the adjacent side of the wheel 1 isrecessed at 8 for its reception. Contacting with the side of the stone 1opposite the disk 4, is a flat clamping ring 9 having a hub 10 mountedon the shaft 3 but keyed in no manner thereto, said ring 9 however beingkeyed at 11 for rotation bodily with the grinding Wheel 1. It is theofiice of the ring 9 to forcewheel l tightly against the disk 4 and tothus rigidly secure it in place, and in attaining this end, thefollowing construction is em loyed.

A collar 12 is keyed at 13 on the arbor 3 adjacent the outer end of thehub 10, and the adjacent faces of said collar and hub are provided withcoacting helical cams 14 whose oblique faces contact with each other insuch a manner as to cause any rotating tendency of the arbor 3 in thewheel 1 to thrust the clamping ring 9 tightly against said wheel, thecollar 12 being held against outward movement along the arbor by a splitring 15 which is received in a circumferential groove 16 formed in saidarbor, a shim 17 being by preference interposed between said split ringand the collar 12.

The arrangement of parts above described permits easy assembling anddisassembling without the loss of time and the wheel 1 is much moreeffectively clamped in place than by the old method. Any tendencywhatever on the part of the shaft 3 to turn within the wheel 1, will beutilized to cause obvious that although my invention is ofextremelysimple and inexpensive nature, it will be highly eflicient anddesirable, and since probably the best results are obtained from theseveral features shown and de-' scribed, they are preferably employed.Within the scope of the invention as claimed however, numerous minorchanges may well be'made as occasion may dictate.

I claim:

In a pulp mill grinding wheel mounting, an arbor reduced in diameter toform an outstanding shoulder, a wheel clamping disk surrounding thereduced part of said arbor and bearing against said shoulder, a keysecuring said disk to the arbor for rotation bodily therewith, agrinding wheel mounted on the arbor and bearing against the inner sideof said disk, the latter having a hub extending into said wheel, asecond clamping disk mounted on the arbor and free to turn thereon, saidsecond disk having a hub extendin latter being provided with a radialkey-way adjacent said second disk, a key in said keyway for securingsaid second disk and the grinding wheel together for movement in unison,wedge shaped cams on the outer side of said second disk,'a collarsurrounding the arbor and having cams engaging said first named cams, akey securing said collar to said arbor, a washer abutting the outer sideof said collar, and a split ring against which said washer bears, saidarbor having a peripheral groove in which said ring is secured.

In testimony whereof I have hereunto set my hand.

JACOB J. GRAIN. Witnesses:

JOHN T. GRAIN, JOHN KAJA.

into the grinding wheel and the

